How to install Octave in Mac OS Yosemite ?

I was trying to execute my Octave scripts to recognize digits using a Neural Network. Octave did not work after I upgraded to Yosemite. Now it works after these steps. It may look simple but this wasted several hours.

brew tap homebrew/science

sudo chmod -R 777 /usr/local/share

brew link –overwrite xz

brew install gcc

I thought this prevented the gcc installation from completing.

==> ../configure –build=x86_64-apple-darwin14.3.0 –prefix=/usr/local/Cellar/gcc/5.1.0 –li
Error: Permission denied – /Users/radhakrishnan/Library/Logs/Homebrew/gcc

So I changed the permissions and tried again.

sudo chmod 777 /Users/radhakrishnan/Library/Logs/Homebrew

brew install gcc

sudo chmod -R 777 /usr/local/include/freetype2

brew link freetype

brew install octave –with-x11